Re: [RFC] Low overhead patches for the memory resource controller

[KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>]

> Important: Not for inclusion, for discussion only
> 
> I've been experimenting with a version of the patches below. They add
> a PCGF_ROOT flag for tracking pages belonging to the root cgroup and
> disable LRU manipulation for them
> 
> Caveats:
> 
> 1. I've not checked accounting, accounting might be broken
> 2. I've not made the root cgroup as non limitable, we need to disable
> hard limits once we agree to go with this
> 
> 
> Tests
> 
> Quick tests show an improvement with AIM9
> 
>                 mmotm+patch     mmtom-08-may-2009
> AIM9            1338.57         1338.17
> Dbase           18034.16        16021.58
> New Dbase       18482.24        16518.54
> Shared          9935.98         8882.11
> Compute         16619.81        15226.13
> 
> Comments on the approach much appreciated
> 
> Feature: Remove the overhead associated with the root cgroup
> 
> From: Balbir Singh <balbir@linux.vnet.ibm.com>
> 
> This patch changes the memory cgroup and removes the overhead associated
> with accounting all pages in the root cgroup. As a side-effect, we can
> no longer set a memory hard limit in the root cgroup.
> 
> A new flag is used to track page_cgroup associated with the root cgroup
> pages.

I think this is right direction path. typical desktop user don't use 
non-root cgroup nor cgroup disabling boot parameter.
this patch increase their user experience.

I hope you fix rest technical issue.

thanks.



--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>